[jira] [Created] (LUCENE-10517) Improve performance of SortedSetDV faceting by iterating on class types

["Chris Hegarty (Jira)" <ji...@apache.org>]

Chris Hegarty created LUCENE-10517:
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             Summary: Improve performance of SortedSetDV faceting by iterating on class types
                 Key: LUCENE-10517
                 URL: https://issues.apache.org/jira/browse/LUCENE-10517
             Project: Lucene - Core
          Issue Type: Bug
          Components: core/index
    Affects Versions: 9.1
            Reporter: Chris Hegarty


SortedSetDV faceting (and friends), can improve performance within tight loops by using _invokevirtual_ (rather than _invokeinterface_). The C2 JIT compiler can produce slightly more optimal code in this case, and since these loops are very hot, the impact can be significant (in the order of 10-20%).

The code change amounts to using `SortedDocValues` or `SortedSetDocValues` class types, rather than the `DocIdSetIterator` interface type, in loops (specifically for invocation of `nextDoc()`, when the iterator type is known and not wrapped. 

This issue is in some ways similar, and builds upon, prior optimisations in this area, like say LUCENE-5300.



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